Abstract: A biomass gasifier for producing syngas. The biomass gasifier includes a first tube having an air distribution manifold that extend within the gasification chamber. The first tube is rotatably positioned within a second tube, where the second tube is connected to a mixer below the air distribution manifold. The first tube has an air passage that is fluidly connected to an air source to deliver air to the combustion chamber through a plurality of air outlets within the air distribution manifold for distribution. The first tube is independently rotated from the second tube to evenly distribute air within the combustion chamber and the second tube with the mixer are rotated to agitate the biomass within the combustion chamber once a desired operating temperature range within the combustion chamber has been achieved.